Toolholder



K. ZIEGLER Sept. 30, 1952 TOOLHOLDER Filed Jan. 10, 1948 Aya/Zag? f W Z .f 4@ M j.

atentedr Sept. 30,' 1952 ,UNITED STATES PATENT-0FF1CE- Karl zeglelrlstilfllria, Australia i Application January 10, 1948, Serial No. 1,545 In Australia January 9, 1947 section 1, Public Law 69o, August s, 1946 Patent expires J anuaryiS, 1967 l i 11 Claims. (Cl. 29e-98) This Vinvention relates to tool holdersfor'lathes and the like. Y y n According to previous trade, practice, the only effective method of varying the rake angle of a lathe cutting tool was 'to' remove the toolfrom its holder andregrind the desiredangle. .This is a time wasting andexpe'nsive procedure especially when cement carbide tools are involved. The latterl are costly and'brittle and owing to their hardness require the use of diamond dust or like wheels for carrying out the grinding operation. ,n 4 u;

.The primary object of the present invention is rto provide Yan improvedtoolholder'forlathes or the like which enables' Vrake and other; tool angles to be readily varied-in accordance with requirements without, having tol effect any regrinding.V Y. '1

g'he improved tool holder is of simple andine'xpensive design and is capable of being readily attached to the tool posts .of existing lathes.V V In addition to the above mentioned primary function','the improved tool holder is adapted for use with boring, forming, and a wide variety of other tools.

Various novel constructional featuresfof the improved tool 'holder will be more' readily apparent from the following description' ofi-several practical embodiments.

VReferring rto the ldrawings whichfform part of this specification: l

Figure 1 is an' endview of'al too1'"`liol'der1 in accordance with one embodiment of theQpresent invention.

Figure 2 is a side elevation oflFigur'e 1.

Figures 3v and 4 are an endview and Va sid elevation'respectively of'anadjustable tool sup.- porting element which forms part of the im-v proved tool holder.

Figure 5 is a fragmentary plan view of*A the body member of the tool holder.

Figure 6 is a cross section taken on the line VI'-VI rof Figure 5.

Figure 7 is a fragmentary sideelevation'of a modification which 'is adaptedfor use with boring bars or other tools'. Y Y y Figure 8 is an end view of another modification suitable for holdingboring and other types of tools inv various operative positions. q

"Figurev9 is a perspective view of the segmental tool supporting'element seen in Figure 8.K n

`AOCOI`diI1g JCr the embodimentv illustrated inA Figuresl to 6, the improved tool holder includes a stationary "body memberl providedlwith a supportingk barV or the like 3 forv connectionlto 2 l the 'usual' tool post on a lathe or the like.A This bar, which is preferably formed integral with the body member, may be of squaresection .and offset at one side of the body portion so as to extend lengthwise thereof beyond the inner end of the body member. The latter is provided with a central bore 4 which is open ended and preferably parallel sided. v

The body member may be cut away at one side, for example opposite to the supporting bar 3 so as to provide an open mouth 6 which extends lengthwise of the body member and provides access to the central borey and greater clearance at that side of the tool holder. Y

Rotatably mounted within the body member is an adjustable tool supporting element l.- The latter includes a shank 8 which is of part cylindrical formation and adapted to form a relatively close t within the central bore of the body portion. The shank is provided at one end with a part circular laterally extending locating flange S which may be provided with a tapered outer face on which a series of graduations l I are The shank 8 is cut away at the inside remote from the curved outer surface thereof in stepped formation so as to provide two fiat surfaces yl2 and i3 respectively adaptedV to form an angular seating for the cutting tool llll which is usually of square section. These flat surfaces are preferably disposed at right-angles `to eachother and one or both may be parallel to the'axis rofthe Shank. A

The adjustable tool supporting element 1 usually occupies an operative position in whichone of the flat surfaces such as I2 is upright; 1 The associated fiat surface which may be conveniently referred to as the inclined supporting surface i3, may be inclined downwardly and inwardly from the flange 9 to the opposite end of the shank so as to suitably tilt the axis of the cutting tool in accordance with requirements.` For'example each tool holder may include a set of adjustable tool supporting elements 1 in which theangle of the aforesaid lower supporting surface varies over a predetermined range suchv for instance as frorn 0 to 8 tothe axis ofthe shank.

Associated with the foregoing is means foran# choring the adjustable tool supportingelement 1 in the'desired operative position in the body member. Such anchoring means may comprise one or more clamping bolts or screws I6 which pass .through transverse slots Il in the body member and enter screwed holes i8 inv the shank 8.

In addition means are provided for turning the adjustable tool supporting element axially in relation to the stationary body member. Such turning means may consist of an adjusting screw or stud I9 accommodated within `a screwed hole 2l in the body member and adapted to engage a recess or abutment 22 in the shank.

The square sectioned cutting tool I4 is adapted to be seated upon the aforesaid angular seating on the tool supporting element and retaining means are provided for holding the tool upon its seating. Said retaining meansA may consist of one or more thrust screws or bolts 23', each of which ypasses through a screwed hole 24 in the body member so as to engage the `tool at that side opposite to the aforesaid inclined supporting surface I3. The inner end of each said' thrust screw' 23 is preferably of semi-spherical formation so as `I`l onV the iiange of the adjustable tool supporting element. As such graduations are usually closely spaced, two sets are preferably employed Iand arranged in appropriately spaced circumferential relationship on the iiange. For example one ofthe sets of graduations may read 0, 5, 10,

15, 20 thousandths of an inch, whilst the associated scale may read 2, 7, 12, 17 thousandths of aninch. Thus with each of these sets associated with a separate fixed zero marking, easier readn ing is made possible than if a single scale with closer graduations is employed.

As seen more clearly in Figs. 5 and 6 of the drawings the operative position of the adjustable tool supporting element in the body member may be reversed accordance with requirements. VFor this purpose each body member 2 may be Iprovided with two sets of right hand and left hand tool supportingY elements 'I and the body member may be provided with oppositely disposed tapped holes 2l#y for the thrust screws or belts 23. In addition;` oppositelydisposed transverse slots I1 may be provided in the body member to accommodate the anchoring bolts or screws I6.

I`fl` desired provision may be made for breaking ofivthe helicall-y coiled metal shortly after it leaves the cutting tool when the device is in use. For this purpose a removable chip breaker 25 may be mounted upon the outer end of the body memberrso as tol extend laterally across the` cutting tool close. to the cutting edge thereof as seen in Fig. 5.

In use the cutting tool I4y may be readily placed in position uponl its seating on the adjustable tool supporting elementv I and firmly secured in position by means of the thrust screws 23. Any desired. circumferential adjustment of the cutting tool may be readily effected by means of the aforesaid adjusting screw I9 after which the adjustable tool supporting element may be lock-ed inthe adjusted position by means of the clamping .bolts I6. Tilting of the axis of the -cutting tool in accordance with requirements, is obtainable by selecting the tool supporting element whichv has an inclined supporting surface i3 of the most suitable angle.

According to a. modification as illustrated in Fig'. 7' of the drawings, the tool supporting element 'Ia may be of ring-like formation having an open ended central passage 26 forming a seating for the cutting tool and one or more laterally extending screwed holes 24a each of which accommodates a thrust screw 23a to retain the tool in its seating. The ring-like tool supporting element is also provided with a laterally extending shank 21 adapted for removable accommodation within the bore 4 of the body member. I i y v According to another inodication as illustrated in Figs. 8 and 9, the tool supporting element may be in the form of a bar 'Ib of substantially segmental shape in cross section so as to provide a curved outer surface 28 adapted to fit within the bore 4 of the body member and a substantially nat inner surface 25 forming the seating for the tool. The segmental bar may also be provided at an intermediate point in its length with one or more tapped holes I8 each of which is adapted -to receive the inner end of a clamping bolt or screw IB as aforesaid. The modifications illustrated in Figs. 7 to 9 are capable of adapting the improved device for use with boring bars, flat boring tools, drills, reamers vand a varietv of other tools.

In common with the embodiment illustrated in liigures l to 6, the constructions shown inI Figures '7, 8 and 9 also include an adjusting screw or screws as aforesaid or any other suitable means for partially rotating the modified tool supporting elements within the bore of their associated body members. In allv cases the adjusting screw .or the like I9 also performs the additional function of serving as a limit stop for opposingl undesirable movement of the cutting tool when in use.

Instead of forming the aforesaid zero marking 26 on the body member and the associated graduations on the tool supporting element as' aforesaid, the relative positions of these markings may bejreversed if so desired.

Various other alterations, modifications' and/or additions may be incorporated in the foregoing without departing from the ambit of theinvention as dehed by the appended claims.

Having now described my invention, what. I claim as new and desire to secure by' Letters Patent is:

1. An improved tool holder for lathes and the like comprising a body member provided with means for detachably connecting it to a tool post on the lathe and having a centralv bore. a tool supporting element mounted longitudinally in said bore and circumferentially adjustable therein, said element having an elongated longitudinally extending tool seat to support an elongated tool longitudinally ofthe bore with the working end of the tool beyond the end of said bore, said seat being inclined lengthwise of saidltool supporting element to tilt the axisy of the tool upwardly towards its outer end and determine the top rake angle of the tool, means for partially turning the tool supporting element. circumferentially within said bore to adjust the side rake angle of the tool, anchoring means for securing the tool supporting element in the desired operative position and means for .retaining the tool upon its seat. n

l 2. An. improved tool holder for lathes andthe like comprising a body member having a central longitudinal bore adapted to rotatably accommodate an adjustable tool supporting elementof part-cylindrical formin cross section and'provided with a seating. for a tool so that the latter extends longthwise of both the tool supporting element and said body member, screw means for partially turningv the tool supporting elementiand consequently the tool axially within said.' bore,4 anchoring means for securing the tool supporting element in the desired operative position, and.

means for retaining the tool upon its seating, said tool supporting element including a shank which 1s of part cylindrical formation and adapted to iit within said central bore, said shank being provided with a stepped tool seating formed by two flat faces one of which is substantially parallel with the axis of the tool supporting element whilst the other face is inclined lengthwise of said shank so as to progressively diverge from the axis thereof as it nears the inner end of the shank.

3. An improved tool holder for lathes and the like comprising a body member having a central longitudinal bore adapted to rotatably accommodate an adjustable tool supporting element of part-cylindrical form in cross section and provided with a seating for a tool so that the latter extends lengthwise of both the tool supporting element and said body member, screw means for partially turning the tool supporting element and consequently the tool axially within said bore, anchoring means for securing the tool supporting element in the desired operative position, and means for retaining the tool upon its seating, said tool supporting element including a shank which is of part cylindrical formation and adapted to iit within said central bore, said shank being provided with a stepped tool seating formed by two at faces one of which is substantially parallel with the axis of the tool supporting element whilst the other face is inclined lengthwise of said shank so as to progressively diverge fram the axis thereof as it nears the inner end of the shank, said tool supporting element being provided at one end of the shank with a part circular laterally extending locating flange provided with circumferentially spaced graduatidns adapted for use with one or more xed graduations on said body member.

4. A device according to claim 8 wherein said tool supporting element includes a ring-like portian forming said tool seat and having a laterally extending shank adapted for removable connection within the bore of said body member.

5. A device according to claim 8 wherein said tool supporting element is a bar-like member of substantially chordal segment section, the segmental side of said member forming said tool seat.

6. For use in a tool holder for lathes and the like, an adjustable tool supporting element having a shank or part cylindrical formation provided at one end with a part circular laterally extending locating flange and a stepped tool seating on the inside of said shank formed by two flat faces one of which is substantially parallel with Ithe axis of said shank whilst the other face is inclined lengthwise of the shank so as to progressively diverge from the axis thereof as it nears the inner end of the shank opposite to said locating flange.

7. An improved tool holder for lathes and the like comprising a body member provided with an offset supporting bar for removable connection to a lathe tool post, said body member having an open ended central bore which is cut away at one side to form an access opening, an adjustable tdol supporting element having a shank of part cylindrical formation adapted for rotatable accommodation within said bore, the shank being cut away at the inside in stepped formation so as to provide two at faces at substantially right angles to each other and adapted to form a seating for a cutting tool, one of the at faces being substantially parallel to the axis of the shank whilst the other is inclined lengthwise thereof so as to progressively diverge from the axis as it nears the inner end of the shank, a part circular laterally extending locating flange at the outer end of said shank and having a series of circumferentially spaced graduations thereon adapted to co-operate with one or more fixed graduatidns on said body member, a turning screw 0r stud accommodated within a screwed hole in the body member and adapted to engage an abutment on said shank, one or more clamping bolts or screws each of which is connected at its inner end tov said shank and passes through a transverse slot in said body member and one or more thrust screws or bolts each of which passes through a screwed hole in the body member so as to engage the tool opposite to the inclined supporting face of said seating.

8. An improved tool holder far lathes and the like comprising a body member having a bore, a tool supporting element o.f part-cylindrical form in cross section mounted in said bore and rotatably adjustable therein, said element having an elongated seat for an elongated tool and which extends lengthwise of the tool supporting element to support the tool longitudinally in the bore with the Working end of the tool extending beyond the end of the bore, means for partially turning the tool supporting element and consequently the tool circumferentially within said bore, anchoring means for securing the tool supporting element in the desired operative position and means for retaining the tool upon its seat.

9. A tool holder as defined in claim 8 wherein said body member is cut away to said bore along one side to provide a mouth opening laterally into said bore and enabling the removable fitting of tools laterally through said mouth onto said seat.

10. A toolholder as defined in claim 8 wherein anchoring means comprises at least one clamping screw extending through said body member and threaded at its inner end tc said tool supporting element, said body member having a transverse slot through which said clamping screw extends, whereby to accommodate circumferential movement of said element in said bore to angularly adjust said tool seat.

11. A tool holder as defined in claim 8 wherein said turning means comprises an abutment in the cylindrical portion of said tool supporting element, said body member having an internally threaded hole opening into said bore substantially tangentially thereof, and an adjusting screw threaded in said hole and engaging said abutment for selectively moving said element circumferentially in said bore to adjust the side rake angle of the Itool. i

KARL ZIEGLER.

REFERENCES CITED The following references are of record in the :le of this patent:

UNITED STATES PATENTS Number Name Date 641,241 Sherwood Jan. 9, 1900 745,576 Darling Dec. 1, 1903 1,014,412 Palmgren Jan. 9, 1912 1,050,701 Shouldice Jan. 14, 1913 1,482,916 Dugar Feb. 5, 1924 2,347,136 Speckert Apr. 18, 1944 FOREIGN PATENTS Number Country Date 62,214 Norway Mar. 18, 1940 y 

